fastpylight

Installation

pip install fastpylight

fastpylight is a small Python/Rust wrapper around Lumis, a Tree-sitter syntax highlighter with Neovim themes. Language names, token scopes, and theme names follow Lumis.

Python

from fastpylight import highlight, highlight_spans, guess, theme_css

code = "def f(x):\n    return x + 1\n"

# Output for the CSS Highlight API.
html = highlight(code, "python")

# Static span output.
spans = highlight_spans(code, "python", "hl-")

# CSS rules for the span output.
css = theme_css("github_light", "pre code", "hl-")

highlight returns HTML with token ranges in UTF-16 code units, for use with the CSS Highlight API:

<hl-code toks='[[0,3,"keyword"],[4,5,"function"],[6,7,"variable"],[14,20,"keyword"],[21,22,"variable"],[23,24,"operator"],[25,26,"number"]]'><pre><code>def f(x):
    return x + 1
</code></pre></hl-code>

highlight_spans returns normal HTML spans:

<pre><code><span class="hl-keyword">def</span> <span class="hl-function">f</span>(<span class="hl-variable">x</span>):
    <span class="hl-keyword">return</span> <span class="hl-variable">x</span> <span class="hl-operator">+</span> <span class="hl-number">1</span>
</code></pre>

The exact classes depend on Lumis scopes. A complete GitHub Light CSS example for both output modes is in docs/github_light.css.

Languages

The default language set enables Lumis web, web-extra, system, and backend bundles, plus R, Julia, PowerShell, Lua, Swift, MATLAB, Perl, Pascal, Fortran, and Objective-C.

languages() lists every available name. The highlighting functions need an exact language name and raise ValueError on an unknown one. Use "plaintext" for un-highlighted output:

highlight(code, "plaintext")  # toks='[]', no tokens

To detect a language instead of specifying one, use guess, which takes the code plus an optional hint (a name, extension, or filename) and falls back to "plaintext" when nothing matches:

guess("fn main() {}", "rs")        # 'rust'  (extension hint)
guess("#!/usr/bin/env python\n")   # 'python' (shebang)
guess("just some prose")           # 'plaintext' (no match)

highlight(code, guess(code))       # detect, then highlight

CSS Highlight API

The highlight function is for browser code that applies token ranges with the CSS Highlight API. A minimal component looks like this:

class HlCode extends HTMLElement {
  connectedCallback(){
    if(!CSS.highlights) return;
    setTimeout(() => {
      const d=this.getAttribute('toks'); if(!d) return;
      const tn=this.querySelector('code').firstChild, toks=JSON.parse(d);
      this._ranges=[];
      toks.forEach(([s,e,k])=>{
        const r=new Range(); r.setStart(tn,s); r.setEnd(tn,e);
        const h=CSS.highlights.get(k)||new Highlight();
        h.add(r); CSS.highlights.set(k,h);
        this._ranges.push([r,k]);
      });
      this.removeAttribute('toks');
    }, 0);
  }
  disconnectedCallback(){
    if(!this._ranges) return;
    this._ranges.forEach(([r,k])=>{
      const h=CSS.highlights.get(k); if(h) h.delete(r);
    });
    this._ranges=null;
  }
}
if(!customElements.get('hl-code')) customElements.define('hl-code',HlCode);

highlight needs ::highlight(...) rules. highlight_spans needs class rules. docs/github_light.css includes both for the default hl- prefix.

You can generate CSS at runtime:

highlight_css = theme_css("github_light")
span_css = theme_css("github_light", "pre code", "hl-")

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

fastpylight-0.1.12.tar.gz (22.1 kB view details)

Uploaded Jul 14, 2026 Source

Built Distributions

If you're not sure about the file name format, learn more about wheel file names.

The dropdown lists show the available interpreters, ABIs, and platforms. Enable javascript to be able to filter the list of wheel files.

fastpylight-0.1.12-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (8.3 MB view details)

Uploaded Jul 14, 2026 CPython 3.13manylinux: glibc 2.17+ x86-64

fastpylight-0.1.12-cp313-cp313-macosx_11_0_arm64.whl (8.6 MB view details)

Uploaded Jul 14, 2026 CPython 3.13macOS 11.0+ ARM64

fastpylight-0.1.12-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (8.3 MB view details)

Uploaded Jul 14, 2026 CPython 3.12manylinux: glibc 2.17+ x86-64

fastpylight-0.1.12-cp312-cp312-macosx_11_0_arm64.whl (8.6 MB view details)

Uploaded Jul 14, 2026 CPython 3.12macOS 11.0+ ARM64

fastpylight-0.1.12-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (8.3 MB view details)

Uploaded Jul 14, 2026 CPython 3.11manylinux: glibc 2.17+ x86-64

fastpylight-0.1.12-cp311-cp311-macosx_11_0_arm64.whl (8.6 MB view details)

Uploaded Jul 14, 2026 CPython 3.11macOS 11.0+ ARM64

fastpylight-0.1.12-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (8.3 MB view details)

Uploaded Jul 14, 2026 CPython 3.10manylinux: glibc 2.17+ x86-64

fastpylight-0.1.12-cp310-cp310-macosx_11_0_arm64.whl (8.6 MB view details)

Uploaded Jul 14, 2026 CPython 3.10macOS 11.0+ ARM64

File details

Details for the file fastpylight-0.1.12.tar.gz.

File metadata

Download URL: fastpylight-0.1.12.tar.gz
Upload date: Jul 14, 2026
Size: 22.1 kB
Tags: Source
Uploaded using Trusted Publishing? Yes
Uploaded via: uv/0.11.28 {"installer":{"name":"uv","version":"0.11.28","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"Ubuntu","version":"24.04","id":"noble","libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":true}

File hashes

Hashes for fastpylight-0.1.12.tar.gz
Algorithm	Hash digest
SHA256	`aecd7f3b82c71a39869ee0177e05640000cc4e7d7863db1526579874a38dc808`
MD5	`aa31291f5926607714857b6a6f5a03b5`
BLAKE2b-256	`368e526b81b80173d39bf1f55fe656e60fdc05822480a2b671970e7afbe0543f`

See more details on using hashes here.

File details

Details for the file fastpylight-0.1.12-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.

File metadata

Download URL: fastpylight-0.1.12-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Upload date: Jul 14, 2026
Size: 8.3 MB
Tags: CPython 3.13, manylinux: glibc 2.17+ x86-64
Uploaded using Trusted Publishing? Yes
Uploaded via: uv/0.11.28 {"installer":{"name":"uv","version":"0.11.28","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"Ubuntu","version":"24.04","id":"noble","libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":true}

File hashes

Hashes for fastpylight-0.1.12-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Algorithm	Hash digest
SHA256	`01a28382a186b9ca796fedb902f6101b30931e53a4ebd5302f6c12fb7c286be0`
MD5	`dc9673f9c1c1b60dd94789c228163fc0`
BLAKE2b-256	`6a3e67dc9a5c4ec4f87fc7c1394e532f67cb431d11bb79eaf5ab060714bf202d`

See more details on using hashes here.

File details

Details for the file fastpylight-0.1.12-cp313-cp313-macosx_11_0_arm64.whl.

File metadata

Download URL: fastpylight-0.1.12-cp313-cp313-macosx_11_0_arm64.whl
Upload date: Jul 14, 2026
Size: 8.6 MB
Tags: CPython 3.13, macOS 11.0+ ARM64
Uploaded using Trusted Publishing? Yes
Uploaded via: uv/0.11.28 {"installer":{"name":"uv","version":"0.11.28","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"Ubuntu","version":"24.04","id":"noble","libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":true}

File hashes

Hashes for fastpylight-0.1.12-cp313-cp313-macosx_11_0_arm64.whl
Algorithm	Hash digest
SHA256	`387e839d40597bfd77684274117bc20b05d92c36500f275ba0766349c3bbcd7c`
MD5	`f751d0caa5e6f42fd34ce347cdc73a47`
BLAKE2b-256	`37a0bd91ca3225b8d3835dec32e0f8f14caa642722b1687b833ce64d41a46f21`

See more details on using hashes here.

File details

Details for the file fastpylight-0.1.12-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.

File metadata

Download URL: fastpylight-0.1.12-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Upload date: Jul 14, 2026
Size: 8.3 MB
Tags: CPython 3.12, manylinux: glibc 2.17+ x86-64
Uploaded using Trusted Publishing? Yes
Uploaded via: uv/0.11.28 {"installer":{"name":"uv","version":"0.11.28","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"Ubuntu","version":"24.04","id":"noble","libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":true}

File hashes

Hashes for fastpylight-0.1.12-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Algorithm	Hash digest
SHA256	`17fcbfae00b119b58277da3ae8f4130b68c8dd5a7cec0d7f680e3cc2369798c5`
MD5	`43e2cf4b6759d644b4d93c5616e25813`
BLAKE2b-256	`c66dff8ffa65e1f03797b1b0604fc42857e43d552432e5c0f36d314803e91e2e`

See more details on using hashes here.

File details

Details for the file fastpylight-0.1.12-cp312-cp312-macosx_11_0_arm64.whl.

File metadata

Download URL: fastpylight-0.1.12-cp312-cp312-macosx_11_0_arm64.whl
Upload date: Jul 14, 2026
Size: 8.6 MB
Tags: CPython 3.12, macOS 11.0+ ARM64
Uploaded using Trusted Publishing? Yes
Uploaded via: uv/0.11.28 {"installer":{"name":"uv","version":"0.11.28","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"Ubuntu","version":"24.04","id":"noble","libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":true}

File hashes

Hashes for fastpylight-0.1.12-cp312-cp312-macosx_11_0_arm64.whl
Algorithm	Hash digest
SHA256	`5781bca19eaa5aa411c92d787d096fa38b787af50b0014a20a9467b0e7a967c0`
MD5	`d02b2111cc828e1c432b807a83c34bba`
BLAKE2b-256	`79dd6d90383cfe1c0b0b495041530880de0ac3416b4fa2168425d33b763e3c6c`

See more details on using hashes here.

File details

Details for the file fastpylight-0.1.12-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.

File metadata

Download URL: fastpylight-0.1.12-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Upload date: Jul 14, 2026
Size: 8.3 MB
Tags: CPython 3.11, manylinux: glibc 2.17+ x86-64
Uploaded using Trusted Publishing? Yes
Uploaded via: uv/0.11.28 {"installer":{"name":"uv","version":"0.11.28","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"Ubuntu","version":"24.04","id":"noble","libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":true}

File hashes

Hashes for fastpylight-0.1.12-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Algorithm	Hash digest
SHA256	`dee6acbcf76fde31896e36c12ded47a419fbfe3f75d6c316b648e2e2e4db637e`
MD5	`99de11091f9c003c1680fc778c5a20c6`
BLAKE2b-256	`0080d88b7e67a4d83eed6013ada53be11dc6e1424224087ec5b5ebfbb586e41b`

See more details on using hashes here.

File details

Details for the file fastpylight-0.1.12-cp311-cp311-macosx_11_0_arm64.whl.

File metadata

Download URL: fastpylight-0.1.12-cp311-cp311-macosx_11_0_arm64.whl
Upload date: Jul 14, 2026
Size: 8.6 MB
Tags: CPython 3.11, macOS 11.0+ ARM64
Uploaded using Trusted Publishing? Yes
Uploaded via: uv/0.11.28 {"installer":{"name":"uv","version":"0.11.28","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"Ubuntu","version":"24.04","id":"noble","libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":true}

File hashes

Hashes for fastpylight-0.1.12-cp311-cp311-macosx_11_0_arm64.whl
Algorithm	Hash digest
SHA256	`4017d0c38a60b08148a25e19af1ea4ca0e1af16e6a75192d40eca971f8c5d4ec`
MD5	`23116b9b6dd493f92175aea1c532721c`
BLAKE2b-256	`94dcf4a8b7a6a3f5416ab3e7e663afab85fdee02d06a6b9595955399fbe451ad`

See more details on using hashes here.

File details

Details for the file fastpylight-0.1.12-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.

File metadata

Download URL: fastpylight-0.1.12-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Upload date: Jul 14, 2026
Size: 8.3 MB
Tags: CPython 3.10, manylinux: glibc 2.17+ x86-64
Uploaded using Trusted Publishing? Yes
Uploaded via: uv/0.11.28 {"installer":{"name":"uv","version":"0.11.28","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"Ubuntu","version":"24.04","id":"noble","libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":true}

File hashes

Hashes for fastpylight-0.1.12-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Algorithm	Hash digest
SHA256	`0fb8f50b6b56183c455f1c3141d5deb1f8d5a29817b5df9628cf78ec926b5f78`
MD5	`a15844ec3c7e739988a70fc3c70bcaab`
BLAKE2b-256	`df2b5e11beb5f6b8fbdd39ff700c8dcbe527dbda63620e4bc5d4222d9995922d`

See more details on using hashes here.

File details

Details for the file fastpylight-0.1.12-cp310-cp310-macosx_11_0_arm64.whl.

File metadata

Download URL: fastpylight-0.1.12-cp310-cp310-macosx_11_0_arm64.whl
Upload date: Jul 14, 2026
Size: 8.6 MB
Tags: CPython 3.10, macOS 11.0+ ARM64
Uploaded using Trusted Publishing? Yes
Uploaded via: uv/0.11.28 {"installer":{"name":"uv","version":"0.11.28","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"Ubuntu","version":"24.04","id":"noble","libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":true}

File hashes

Hashes for fastpylight-0.1.12-cp310-cp310-macosx_11_0_arm64.whl
Algorithm	Hash digest
SHA256	`06e1755878e7e902bd468a4d880d919de96be6eab05579c8915dee47402fd236`
MD5	`c38b877264d4f5069a8a52a95b290180`
BLAKE2b-256	`45ae67c6f3610a24c17350e06d5c97c4b8bd9e2448359d1516849cf1f7514aad`

See more details on using hashes here.

Release history Release notifications | RSS feed

0.1.17

Jul 31, 2026

0.1.16

Jul 31, 2026

0.1.15

Jul 24, 2026

0.1.14

Jul 22, 2026

0.1.13

Jul 20, 2026

This release

0.1.12

Jul 14, 2026

0.1.11

Jun 22, 2026

0.1.10

Jun 21, 2026

0.1.9

Jun 21, 2026

0.1.8

Jun 21, 2026

0.1.7

Jun 20, 2026

0.1.6

Jun 20, 2026

0.1.5

May 6, 2026

0.1.4

Apr 12, 2026

0.1.3

Apr 12, 2026

0.1.2

Apr 12, 2026

0.1.1

Apr 12, 2026

0.1.0

Apr 1, 2026

fastpylight 0.1.12

Installation

Python

Languages

CSS Highlight API

Project links

Key dates

2 maintainers

Credits

GitHub Statistics

License

Requires

Provides Extra

Classifiers

Download files

Source Distribution

Built Distributions

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

File details

File metadata

File hashes

Release history Release notifications | RSS feed